Here's a tip from Linda Thayer. I've also included another way to accomplish the task. Choose whichever one suits you best!
HOW TO DELETE FM DESIGNS QUICKER THAN FROM STORAGE:
OPTION 1 (provided by Linda Thayer):
"When we want to delete something we created: I go into my closet and move a bunch of stuff to storage then I move the items I want to delete into my closet and proceed to delete from there....it saves the hassle of being directed or sent back to your front page every time you delete an item! Plus it gives you a better view of what you want & don`t in your closet!" ~ Linda Thayer
OPTION 2 (provided by me):
I usually delete designs right from my Design Closet instead of the DUC Storage or Closet. There's no little "x" box to click anymore to delete them, but if you click on the design and then scroll to the bottom, there's a button that says "Delete Design." I find this to be quicker than deleting multiple designs from Storage.